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dc.contributor.authorLaverick, Kiarnen_US
dc.contributor.authorChantasri, Areeyaen_US
dc.contributor.authorWiseman, Howarden_US
dc.date.accessioned2019-06-19T13:03:37Z
dc.date.available2019-06-19T13:03:37Z
dc.date.issued2019en_US
dc.identifier.issn0031-9007en_US
dc.identifier.doi10.1103/PhysRevLett.122.190402en_US
dc.identifier.urihttp://hdl.handle.net/10072/385426
dc.description.abstractQuantum state smoothing is a technique for assigning a valid quantum state to a partially observed dynamical system, using measurement records both prior and posterior to an estimation time. We show that the technique is greatly simplified for linear Gaussian quantum systems, which have wide physical applicability. We derive a closed-form solution for the quantum smoothed state, which is more pure than the standard filtered state, while still being described by a physical quantum state, unlike other proposed quantum smoothing techniques. We apply the theory to an on-threshold optical parametric oscillator, exploring optimal conditions for purity recovery by smoothing. The role of quantum efficiency is elucidated, in both low and high efficiency limits.en_US
dc.description.peerreviewedYesen_US
dc.languageEnglishen_US
dc.publisherAMER PHYSICAL SOCen_US
dc.relation.ispartofpagefrom190402-1en_US
dc.relation.ispartofpageto190402-6en_US
dc.relation.ispartofissue19en_US
dc.relation.ispartofjournalPHYSICAL REVIEW LETTERSen_US
dc.relation.ispartofvolume122en_US
dc.subject.fieldofresearchPhysical Sciencesen_US
dc.subject.fieldofresearchcode02en_US
dc.titleQuantum State Smoothing for Linear Gaussian Systemsen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Articlesen_US
dc.type.codeC - Journal Articlesen_US
gro.hasfulltextNo Full Text


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